Arc light



' (No Model.) 2 Sheets-Sheet 1.

(J. B. NOBLE.

ARC LIGHT.

Patented Nov. 29, 1887.

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(No Model.) 2 Sheets-Sheet 2. G. B. NOBLE.

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No. 374,129. if N0v.2 9, 1887.

N. PETERS, Pho\w-Lilhngnphur, Wanh'mginn, n a

UNITED STATES PATENT OFFICE.

CLARENCE B. NOBLE, E CLEVELAND, OHIO.

ARC LIGHT.

SPECIFICATION forming part of Letters Patent lfl'o.374,129, dated November 29, 1887.

I Application filed July 12, 1887. Serial No. 244,049. (No model.)

To all whom it may concern:

Be it known that I, CLARENCE l3. NOBLE, a

, citizen of the United States, residing at Clevecurrent from one set of carbons to another when the former has been nearly or quite conparticularly pointed out in the claims.

In the accompanying drawings,which illustrate my invention, Figure 1 is a perspective view of the mechanism of my improved lamp, two sides of the casing being removed. Figs. 2 and 3 are respectively side and front elevations of the mechanism. Fig. 4 is a horizontal section, and Figs. 5, 6, 7, and 8 show details.

In this application two different forms of clutch are shown and described. Figs. 1, 5,

and 6 show'one of them, and Figs. 2, 8, and 4. the other. The clutches are acted upon to feed the-rod by substantially the same mechanism in both instances, and the present invention has reference more particularly to this mechanism.

Referring to the drawings by letter, Z is the frame of my lamp, and ac and xare two set of carbonsforming. part thereof.

r A and B. represent the usual fine and coarse wire magnets, which act differentially on a common core, 0. Pivoted to the core and to a standard, G, is a bar, L, to which, between its pivots, is attached a horizontal bar, K, extendingat right angles beneath the said bar L. The ends of the bar in the form of lamp shown in Fig. 1 are located beneath ringclutches d d on the carbon rods T T. The clutches are supported on the ends of hooked links 1? P, which are suspended from the extremities of U-shaped formations on the ends of a lever, h, which latter is pivoted to an extension, E, of the standard G. The lever h is normally tilted, so that one end-say that which supports the clutch d-is lower than the other, being under tension from a spring, '2',

In Figs. 2, 3, and 4 I show a different kind of a clutch, being identical with one for which I received a patent numbered 346,217 and dated July 27, 1886. In this construction the clutch d consists of a disk located within the hollow carbon rod and supported by two rods or wires, wand 12. The rod w in this instance is connected loosely to the disk and the rod 1) is bent at the lower end and hooks into a slot in the disk. The latter is permanently attached to a brass arm, S, which rests upon an insulating-block, R, on the bar K. The wire 10 passes loosely through the said arm S, which serves to prevent its moving to one side. The lifting of the rod or wire o, due to the action of the lamp in establishing the arc. tilts the disk and raises the positive carbon of the :0 group. The same action has no effect upon the other clutch,(which is constructed in the samenianner,) because the disk is held up out of the way of the moving rod, as shown in Fig. 3. The lever h is connected with the movable core I) of magnet D. This magnet is wound with both fine and coarse wire, the fine wire being in the same shunt around the arc with magnet B and the coarse wire forming a part of the main circuit. The core I) carries a projection, b, which plays between two pairs of contacts, a a and 0 and a. The contact a is the terminal of the coarse-wire coil on magnet D, and the others are pieces separately supported by an insulating-block, as shown.

Referring to Fig. 3, the main circuit enters the lamp at], and after passing around magnet A branches at A, one branch, 1, going to contact'a, and the other, 2, to the coarse coil of magnet D. Which course the current takes depends on the position ofthe strip b with reference to the contacts, as will be now explained. The normal position of the core b is down. The current in passing through the lamp energizes magnet A, lifts its core, and accordingly the bar K. Bar K tilts the clutch d, which grips the rod and causes it to rise and establish the arc. As the carbons are consumed and the resistance becomes greater, more of the current is shunted into magnet B, which operates on the core in the usual way and lowers the bar K, allowing the rod to feed. The course of the current is now as follows: from through magnet A, out at A and along branch 1 to contact a, through strip b to contact a, to upper carbon, to lower carbon, and to When the arc is established, the movement of bar K'is not long enough to impinge against the ring d, and so rod T and the m carbons only are separated. When, however, the carbons are nearly consumed, the resistance increases abnormally and the current in the shunt becomes stronger until magnet D becomes sufficiently energized to lift its core and lift the strip 6 from contacts a and a. The full current then passes through the shuntwire, drawing core b up until strip 1) makes contact with 0 and a. \Vhen this contact is 'made, the main current then passes over branch wire 2, through coarse coil on magnet D, contact a to strip 12, contact 0 to the carbons w, and thence to-. The heavy our- 7 rent now passing through magnet D holds the strip 2) against the contacts. The lifting of the core I) also causes the tilting of lever h to a horizontal position, so that ring d is brought within the movement of bar K, and as h becomes horizontal at the same time core b is elevated the ring d will be lowered upon the bar K and be tilted to grip the rod, while the ring d will be lifted away from the bar K. The parts are adjusted so that the point at which this rod is elevated by bar K will be the point at which the are is established. The x carbons will now be consumed and fed in the same manner that the w carbons were. The main core 0 is slotted and a block, J, is inserted into the slot and hung on a pin which passes laterally through the core and projects through the side thereof, where it has secured to it an arm, 6. The block J is also slotted to allow the pin 0" to slide within it, and it has an enlarged base, which extends out beyond the core to rest on the head of the magnet B, as will be set forth. The bar L is pivoted to this block. The arm 6 extends out and over the spring-armature F of a magnet, O, which is secured to any convenient part of the lamp-frame. The armature is insulated, as shown, and has a piece of soft iron, e, secured to its lower face, and is further provided wit-h contact in, which engages with contact a on the head of the magnet O, the

latter contact being one of the terminals of said magnet. The terminals are in a branch circuit around the lamp from to as shown in Figs. 2 and 3. When the second set of carbons, x, are burned out, the resistance becomes excessive and the. magnet B draws the core down until the block J rests on top of the spool. Then the core continues to settle and the pin 0 to move in the slot of J until arm 6 forces the spring F down so that contact is made between an and a. The lamp is thus cut out or short-cireuited, and so long as the current passes through magnet O the armature F will be held down. The magnet D does not act to tilt the lever it until the resistance of the x carbons becomes excessive, owing to the complete or nearly complete exhaustion of the said carbons, or of one of them. Under other conditions the spring Y counterbalances the pull of the said magnet. The core a may be supported on a spring, which can be placed in the hollow core of the magnet B, so that when the carbons are normally feeding the weight of the said core will not cause the arm 0 to bear down upon the armature F, to cut out the lamp-that is, the weight of the core 0 is counterbalanced by a suitablyplaced spring. During the consumption of the first set of carbons the carbons of the second set are in contact, the upper carbon being supported by the lower, and thus the arc establishing and feeding magnets are relieved of its weight. Similarly while the second set is being consumed the unused stub of the upper carbon of the as set is resting on the lower carbon. In each instance the clutch of the set not in use is raised out of the path of the bar K. It is evident that the contacts a and a may be dispensed with and that the branch 1 may run directly from A to the carbon rod T. It is true that in this case there would be a circuit through the first set of carbons, or what remained of them, after the second set began to burn; but the resistance of such circuit would be so great as practically to cut out the first set.

What I claim is-- 1. The herein-described mechanism for automatically switching the current from one set of carbons to the other, consisting of the magnet D, carrying a coil of fine wire which is located in a shunt around the arc, and also a coil of coarse wire which is adapted to form a part of the main circuit, the core of'said magnet being movable, connected with the tilting lever h, and carrying contact-piece b, in cornbination with two pairs of contacts so arranged that when the piece b bridges one pair the main current shunts the magnet D and when it bridges the other pair the main current passes through the said magnet, as set forth.

2. In an electric lamp in which two sets of carbons are operated successively, the combination, with a tilting lever carrying at each end a clutch for operating to feed each set of carbons, of an arm, K, magnet D and its core, and spring Y, for making operative successively the clutches when they are thrust within the movement of said arm, the said contacts its reach byethe tilting lever, the motions of completing a circuit to cut out the lamp, 81kbthe lever being controlled by the partial or stantially as described. entire consumption of a set of carbons, as In witness whereof I have hereunto affixed I? 5 specified. my seal and signed my name in the presence 3. In an electric lamp, a slotted core for the of two subscribing witnesses. main and shunt magnets, a slotted block slid- CLARENCE B NOBLE [L S] ing within the slot in the core, a pin passing through the core and the slot in said block, Witnesses:

10 an arm connected with said in, and a pair of J ANE W. HUTOHINSON, contacts adapted to be brought together by EUGENE R. NOBLE. 

